I wasn't able to run your test case out of the box (theme referenced but not included, store referenced but not included, etc.).
There have been a number of fixes to the framework since 4.0.x. Have you tried your code with 4.2.1 to see if the issue you're observing has been fixed?

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EXt js line chart time series step is not working properly

EXt js line chart time series step is not working properly

Hi all.

Still i am not able to find solutions. can any one help me...........
I have attached the screen shot and my code ...please check it and let me know the changes.. in this POC i am using EXT js 4.2.1.. but still i have issue...

Still i am not able to find solutions. can any one help me...........
I have attached the screen shot and my code ...please check it and let me know the changes.. in this POC i am using EXT js 4.2.1.. but still i have issue...

I wasn't able to run your test case out of the box (theme referenced but not included, store referenced but not included, etc.). Can you post a stand-alone test case to demonstrate the issue you're seeing?

I faced this few weeks ago.
There is a bug in calculations of time axis labels. Each tick is calculated based on an precalculated number of days and adding them to first day of month This probably works for most of ticks but there are case like yours or mine which by simply adding 30 days to previous tick gives the same month, or in cases like February when skips the month.

My fix was to add a label renderer for time axis and adding 7-15 days to date that comes as input parameter. By adding 7-15 days will make the days addition to return approximate the middle of each month, therfore when the date is formatted using the specified format will get you the correct month. This should work if you don't need the day to be displayed in the label.